Lifting-jack



F. L. GORMLEY.

UF TING JACK.

APPLICATION FILED SEPT. 3, I920.

Patented May 17, 1921.

3 SHEETSSHEET I.

lEwe'ntor: gL.G0ranZe F. L. GOR-MLEY.

LIFTING JACK.

APPLICATION FILED SEPT. 3, 1920.

Patented May 17, 1921.

SHEETF-SHEET F. L. GORMLEY.

unms JACK.

APPLICATION FILED SEPT- 3, 1920 Patented May 17, 1921.

3 SHEETSSHEET 3. 1113.6.

Inventor: I'rank L.Gormle by Jilly.

UNITED STATES PATENT grrlcs. i

FRANK L. GORMLEY, OF BROOKLINE, MASSACHUSETTS, ASSIGNOR TO A. O. NORTON,

I1\TC., OF BOSTON, MASSACHUSETTS, A CORPORATION OF MAINE.

LIFTING-JACK.

Application filed September 3, 1920.

To all whom it may concern:

Be it known that I, FRANK L. GORMLEY, a citizen of the United States ofAmerica, and a resident of Brookline, in the county of Norfolk andCommonwealth of Massachusetts, have invented certain new and usefulImprovements in Lifting- Jacks, of which the following is aspecification.

This invention relates to lifting jacks and particularly to devices ofthis character desi ned for heavy work, the object of the presentinvention being the provision of means whereby the load maybe held inraised position by means of suitable holding mechanism, which holdingmechanism may be released to permit the load to be lowered under its ownweight and may be actuated to regulate the lowering of the movablemember and prevent it from moving at an excessive speed.

Another object of the invention is the provision of means whereby all ofthe actuating and holding mechanisms and speed regulating devices may beremoved readily from the jack standard.

The invention consists primarily in pro viding the jack standard with aremovable side plate on which are mounted the mechanisms for actuatingand holding the main lifting screw and also the devices for controllingthe speed of lowering of the movable member.

The invention further consists in certain novel features of constructionand arrangement of parts which will be fully understood by reference tothe description of the drawings and to the claims to be hereinaftergiven.

For the purpose of illustrating the invention, one preferred formthereof is illustrated in the drawings, this form having been found togive satisfactory and reliable results although it is to be understoodthat the various instrumentalities of which the invention consists canbe variously arranged and organized and the invention is not limited tothe precise arrangement and organization of these instrumentalities asherein shown and described, except as required by the scopeof theappended claims.

Of the drawings:

Figure 1 represents a horizontal section of a lifting jack embodyingtheprinciples Specification of Letters Patent.

Patented May 1'7, 1921.

Serial No. 408,012.

ofthe present invention, the cutting plane belng on line 1, 1, on Fig.2.

Fig. 2 represents a vertical section of the same on line 2, 2, onFig. 1. I

Fig. 3 represents an inside elevation of the, removable side plate withthe actuating parts mounted thereon, the main actuating shaft beingshown insection.

Fig. 1 represents a horizontalsection of the same on line 1, 1, on Fig.3.

Fig. 5 represents a vertical section of the same 011 line 5, 5, on Fig.4.

Fig. 6 represents a vertical section of the same on line 6, 6, on Fig.4', and V Fig. 7 represents an elevation of the brakearm actuatinglever.

Similar characters indicate like parts throughout the several figures ofthe drawings.

- In the drawings, 10 represents a suitable base supporting a stationarystandard 11 over the outer periphery of which is fitted a movable sleeve12, to the upper end of which is threaded a cap 13.

In the upper end of the standard. 11 is mounted a nut 14 to which isthreaded a lifting screw '15 having splined to its upper reduced end abevel gear 16 with which meshes a bevel gear 17 formed upon or securedto a revoluble shaft or spindle 18, the outer end of which is providedwith a suitable operating mechanism 19 of any well known construction.

Between the upper face of the bevel gear 16 and the inner face of thecap 13 are two annular plates 20, 21, between which are. interposed aplurality of anti-friction members 22.

The movable member 12 is provided on i one side with a flangedprojection 24 having a removable plate 25 secured thereto by bolts 25 7The plate 25 is provided with a gland 26 having a bearing 26 for thespindle or shaft 18 and secured to the hub of thegear 17 is a ratchetwheel 27 r The gland 26 extends beyond the inner face of the plate 25forming a boss or sup- 7 port 28 and on this boss 28 is loosely mountedthe gear wheel 29 having secured to one face thereofa plurality of pawls3O coacting with said ratchet wheel 27 The gear 29 is provided witha'plurality of projections 31 to the outer ends of which is secured aring 32 between which and said gear the pawls 30 are positioned.

From the back of the free end of each pawl 30 extends a lug 33 on whichis disposed a helical spring 34 the outer end of which bears against oneof the projections 31 and retains said pawls 30 in engagement with saidratchet wheel 27 under normal conditions.

Beneath the gear wheel 29 is a revoluble shaft 35 having securedthereto, a pinion 36 meshing with said gear 29 and driven thereby whenthe movable member 12 of the jack is being lowered.

.The shaft 35 has also secured thereto a worm wheel 37 which meshes witha worm 38 revoluble in bearings 39 in the bracket 40 secured to theinner face of the removable plate 25 by screws 40*.

To the reduced end 41 of the worm 38 is secured a flanged bushing 41forming a support for the freely revoluble brake disl 42 with theperiphery of which coacts two brake members 43 pivoted at 44 to thebracket 40.

The lower end of each brake member 43 is provided with a recess 45 inwhich is positioned one end of a helical spring 46 the opposite ends ofsaid springs being disposed in the recesses 47 and 48 in the removableplate 25 and bracket 40.

Between the lower adjacent ends of the brake members 43 is positioned aflat sided projection 49 formed upon the actuating lever 50.

. A portion of the flat sided projection 49 is cylindrical andpositioned in a cylindrical hole in the flange of the removable plate25.

The springs 46 normally retain the brake members in contact with theperiphery of the disk 42 and prevent itsrotation until the actuatinglever 50 is moved to cause said flat sided projection 49 to separatesaid brake members 43 and remove them from contact with the disk 42.

The worm 38 is provided at its oppositeend with a reduced end 51 towhich is se-* cured a gear 52.

The gear 52 meshes with the pinion 53 on one end of a shaft 54 parallelwith the worm 38 while the opposite end of said shaft 54 has securedthereto a gear 55 meshing with a pinion 56 on the hub of which the brakewheel 42 is secured.

The shaft 54 revolves in a long bearing 57 formed in the bracket 40.

The flange of the bushing 41 prevents the displacement of the pinion 56andthe brake wheel 42 secured thereto and revoluble therewith.

A stop pin 59 projects from the end of the removable plate or cover 25and serves to limit the movement of the lever 50 in the direction of thearrow a. on Fig. 7 of the drawings.

This plate 25 is also provided with a flange 60 extending outwardlytherefrom which flange not only serves to limit the movement of thelever 50 in a direction opposite to that indicated by the arrow (1, butalso serves to prevent the lever from being accidentally hit and movedfrom its normal position as indicated in said Fig. 7

lVhen the lever 50 is in the position shown in Fig. 7, the cam member 49is in the position shown in Fig. 6 and the brake members 43 are incontact with the brake wheel 42 and the friction between these members43 and said wheel 42 is sufficient to hold the load in raised position.

By providing a train of gears between the gear 52 secured to one end 51of the worm 38 and the pinion 56 loosely mounted upon the bushing 41secured to the opposite end of the worm 38, the brake wheel 42 isrevolved at a speed greatly exceeding the speed of rotation of said worm38 and consequently a light contact of a brake member 43 on theperiphery of said wheel 42 will control the speed of lowering of themovable member 12 of the jack.

By manipulating the lever 50 any degree of frictional contact betweensaid brake members 43 and brake wheel 42 may be secured and consequentlyany speed of lowering may be attained.

If the operator releases the lever 50 when moved from stop pin 59 in thelowering of the jack, the springs 46 will immediately return the lever50 to the position indicated in Fig. 7 and the brake arms to theirnornial position in contact with the brake wheel 2;: The means employedofsecuring a high speed to the brake wheel 42 loosely mounted pon oneend of the worm 38 from a drivng member secured to and revoluble withthe other end of said worm, is simple and ompact occupying but littlespace which Iobviously is of great advantage particularly in themanufacture of the smaller sizes of jacks.

i lVloreover the partsare more readily assembled and the operating partsare provided with better bearing surfaces thereby insuring longer lifeto the jack and less liability of its being placed temporarily out ofcommission.

All of the actuating parts are mounted upon single side plate which maybe removed quickly to give access to the interior of the ack orto repairor replace any of the moving parts on said plate.

Old style jacks having no devices for automatically controlling orretarding the lowering of the movable' member 12 under he Weight f e eamy e chan read- V *ily into self-run-down jacksby simply removing theold side plate and substituting therefor the side plate herein shown anddescribed with its actuating parts secured thereto.

The worm shaft 61 has a cup-shaped member 62 mounted thereon abuttingthe housing '68 for: the gear 52 and a washer 64 abutting the end of theworm 38 and between the cup-shaped member 62 and washer 64, are aplurality of anti-friction movement will be imparted to..the shaft 61and the gear 52.

When it is desired to raise themovable member 12, the operatingmechanism '19 is 2 manipulated to turn the spindle 18 and gear 1'7formed thereon inthe direction of the arrow 6 on Fig. 3 of the drawings.

When this is done the ratchet 27 will freely pass the pawls 30 withoutactuating the spur gear 29. w

- While lifting the load the operating mechanism will'act directlyiuponthe movable member 12 without afiecting the speed tarding and brakingdevices. v r When the weight" has been lifted'suiiiciently, it will beretained in its elevated position by means of the frictionmembers 43coacting with the brake disk 42 and preventing the rotation of the worm38.

When it is desired to lower the load supported by the movable member 12,the friction members 43 are removed from contact with the disk or wheel42 by pressing upon the arm .or'lever and with the pawls 30 inengagement with the teeth of the ratchet 27, the gear 29, pinion 36,worm wheel'37 and worm 38 will be driven by the rotation of the gear 17and its spindle 18. r

The pitch of the worm thread is such as to permit the jack to startautomatically to descend under its own load when its brake is released.

Should an excessive load be upon the cap 13 so that member 12 movesdownwardly too rapidly, its movement will be arrested by themanipulation of the lever 50.

If it is desired toentirely stop the lowering of the load pressure isremoved from the actuating lever 50 and the brake members 43 will beforced into contact with the disk 42'.

The multiplication of the braking power through the high ratio gearingand through the worm and worm wheel will serve to make possible thequick and easy stoppage by a light pressure of the brake, of thedescending jack at any point.

It is believed that the operation and many advantages of the inventionwill be readily understood without further description.

Ha'ving thus described my invention, I claim- I 1. In a lifting jack, arevoluble. operating shaft; a rev'oluble-gearin axial alinementtherewith; means'on said'sh'aft for rotating said gear in one directiononly andthat during the lowering operation; a worm adapted to be rotatedby said gear; a gear secured to one end of'said worm; a pimon meshingtherewith a shaft parallel to said worm to one endof which'said pinionis secured; a gear secured to the opposite end of said parallel shaft; apinion freely revoluble 7 about the axis. of said worm and meshing withthe gear on said parallel shaft; a'brake wheel revoluble with thelast-mentioned pinion; and means coacting with said brakev wheelfor-normally preventing the rotation thereof.-

2. In a lifting jack a revoluble operating shaft; a worm; meansinterposedbetween said shaft and w'orm for rotating the latter securedto one end of said worm and revolubletherewith; a pinion revolubleabout-the axis of said" worm and independently thereof; mechanism forimparting rotaryv movement tosaid p1n1on from said gear; and

braking mechanism revoluble with said pinion. 1-

i '3'. In a lifting jack, a revoluble operatmg shaft; a-worm;meansinterposed betweenv said shaft and worm for rotating the latteronlyduring the lowering operation; a gear secured to one end of saidworm and revolu ble therewith; a pinion revoluble about the axis of saidworm and independently thereof; mechanism 'for imparting rotary movement,only during the lowering operation; a gear to said pinion from saidgear a brake wheel revoluble with said'pinion' and means coacting withsaid brake wheel for normally'preventing the rotation thereof.

4. Ina lifting j ack; a revoluble operating shaft; aworm; meansinterposed between said shaft and worm for rotating the latter onlyduring the lowering operation; a gear secured to one end of said wormand revoluble therewith; a pinion revoluble about the axis of said wormand independently thereof; mechanism for imparting rotary movement tosaid pinion from said gear;

and adapted to rotate independently thereof; means driven fromtheopposite end of said worm for rotating said brake wheel at a ..speedgreatly exceeding the speed of and a speed retarding device adapted tobei said worm; andv means coacting withsaid wheel for normally preventingthe rotation thereof, r

6. In a lifting jack, a revoluble operating shaft; a revoluble gearadapted to be rotated thereby in one direction only and that during thelowering operation; a worm; mechanism actuated by said gear for rotatingsaid worm; a speed controlling member alined with said worm androtatable independently thereof; and a train of gears between said wormand speed controlling member for rotating the latter at a speed greatlyexceeding that of the former.

7. In a lifting jack, a revoluble operating shaft; a revoluble gearadapted to be rotated thereby in one direction only and that during thelowering operation; a worm having reduced threaded ends; mechanismactuated by said gear for rotating said worm;

a flanged sleeve on one threaded end; a pinion freely revoluble thereon;a speed controlling member secured to and revoluble with said pinion;and a train of gearing for rotating said pinion, the initial drivinggear of which is secured to the other threaded end of said worm.

8. In a lifting jack a revoluble side plate;

a flanged gland therein; an operating shaft revoluble in said gland; agear revoluble about the inner end of said gland; means mounted onfandrevoluble with said shaft for rotating said gear in one direction onlyand that during the lowering operation-;a revoluble worm mounted on saidplate; means actuated by said gear for rotating said worm; a speedretarding device mounted on one end of the worm and rotatableindependently thereof; a driving member secured to the other end of saidworm and revoluble therewith; and means interposed between saidretarding device and said driving member and actuated by the latter for.imparting rotary movement to said retarding device at a speed greatlyin excess of that of said driving member. 1

9. In a lifting-jack, a removable side plate provided with a lateralbearing; anoper ating shaft revoluble in said bearing; a

freely revoluble gear alined with said shaft; means on said shaft forrotating said gear in one direction only and that during the loweringoperation; a bracket secured to the inner face of said plate; a shafthaving operating shaft revoluble ,insaid bearing;

a freely revoluble gear alined'with sald shaft; means on said shaft forrotating said gear in one direction only and that during the loweringoperation a bracket secured to the inner face ofsaid plate; a'shafthaving hearings in said plate and bracket; a pinion revoluble with saidshaft and driven by said gear; a worm, gear also revolublewith saidpinion shaft; :a wormrevolubly mounted in said bracket and adaptedto bedriven by said worm gear; a speed retarding device mounted on said worm;ajdriving; gear ro tated by said worm; and a-train of gears actuated bysaid driving gear for rotating said retarding device at a speedgreatlyin excess of that of said worm.

7 Signed byme at 74.67 OldjsouthBld Boston Mass, this 1st. day ofSeptember, 1920. H a V FRANK n GORMLEY.

lVitnesses: 4

WALTER E. LoMBARn, a NATHAN Lo BA p.

